CCS/MSP432P401R: Code for controlling Adafruit-MCP4725 using MSP432

Nabil Khalid

Part Number: MSP432P401R

Tool/software: Code Composer Studio

Hi,

I am have just started using the MSP432 microcontroller and I am facing some difficulties in using it. I would like to program the Adafruit-MCP4725 using this microcontroller. Can someone please tell me how can I do that? I was previously doing it with Arduino and it was quite simple, but doesn't seem with MSP432! Here are a few questions that I'd like help with.

Q1. Can someone please share the code for controlling the Adafruit-MCP4725 with MSP 432. I don't mind if the code is for Energia or CCS. The code can be as simple as setting the DAC to 2 Volts as I only need the method of enabling the I2C communication. Please mention the ports that I must use for SDA/SCL.

Q2. In the Pin label diagram of Energia, given on their website, There are two sets of SDA/SCL as P1_6/P1_7 and P6_4/P6_5. while trying to get P6_4/P6_5 working, I burnt P6_5. Can I use P1_6/P1_7 for I2C communication? If so, How can I do that? What changes are required, say I am using Energia for coding my uC.

Thank you in advance.

over 6 years ago

0 Chris Sterzik over 6 years ago

TI__Guru 57716 points

I cannot speak to the energia code but I can point you to examples to send data via I2C from the MSP432 acting as the master.

dev.ti.com/.../

Please note that this example uses P1.6 and P1.7. There are 4 instantiations of the eUSCIB peripheral so you can choose from the respective pins, please refer to the device datasheet. There are several 'master' variants found in the resource explorer and there are also examples written for TIDrivers:
dev.ti.com/.../

If you have questions about the driverLib APIs for configuring the GPIO as description can be found here:
dev.ti.com/.../group__gpio__api.html

Regards,
Chris

0 Joe G. over 6 years ago

TI__Mastermind 25846 points

2 options for Energia pins:
1. You can manipulate pins_energia file as mentioned here: e2e.ti.com/.../771781
2. Import the .ino file into CCS (or even CCS Cloud at dev.ti.com) and then debug step-by-step as shown in the older (but still relevant) MSP432 example here: e2e.ti.com/.../663178

0 Nabil Khalid over 6 years ago in reply to Chris Sterzik

Prodigy 40 points

Thank you so much. It was a bit cumbersome, but I was able to modify the first example to control my DAC.

0 Nabil Khalid over 6 years ago in reply to Joe G.

Prodigy 40 points

Thank you for your reply.

I actually found that the I2C pins in energia can be modified as mentioned in forum.43oh.com/.../

using 'Wire.setModule(1)' at the begning in my Energia Code, I was able to use SCL(0) and SDA(0) for the communication between uC and DAC.

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CCS/MSP432P401R: Code for controlling Adafruit-MCP4725 using MSP432